I had absolutely No problems with Toronto airport with my visa. And I had previously been denied entry there 2ce. heck, I'd gone thru there so many times I think I had met every single CBP employee in terminal 2!

For the visa tho, easy as pie. Took all of 10 minutes to process me and send me on my way. Didn't even do secondary inspection, everything was done right there at the CBP wicket. They took fingerprints (index fingers only) photo, stamped my passport and I-94 and took my envelope. That was it.